CVE-2021-32766 — MEDIUM (5.3)

Q: How severe is CVE-2021-32766?

CVE-2021-32766 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2021-32766?

Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Nextcloud Server.

Vulnerability Description

Nextcloud Text is an open source plaintext editing application which ships with the nextcloud server. In affected versions the Nextcloud Text application returned different error messages depending on whether a folder existed in a public link share. This is problematic in case the public link share has been created with "Upload Only" privileges. (aka "File Drop"). A link share recipient is not expected to see which folders or files exist in a "File Drop" share. Using this vulnerability an attacker is able to enumerate folders in such a share. Exploitation requires that the attacker has access to a valid affected "File Drop" link share. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.0.1. Users who are unable to upgrade are advised to disable the Nextcloud Text application in the app settings.

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Nextcloud	Nextcloud Server	< 20.0.12

Related Weaknesses (CWE)

CWE-209

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gcf3-3Third Party Advisory
https://github.com/nextcloud/text/pull/1716PatchThird Party Advisory
https://hackerone.com/reports/1253475Permissions RequiredThird Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gcf3-3Third Party Advisory
https://github.com/nextcloud/text/pull/1716PatchThird Party Advisory
https://hackerone.com/reports/1253475Permissions RequiredThird Party Advisory

FAQ

What is CVE-2021-32766?

CVE-2021-32766 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Nextcloud Text is an open source plaintext editing application which ships with the nextcloud server. In affected versions the Nextcloud Text application returned different error messages depending on...

How severe is CVE-2021-32766?

CVE-2021-32766 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-32766?

Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Nextcloud Server.